diff -pruN 3.1.0-3/debian/changelog 3.1.0-3ubuntu1/debian/changelog
--- 3.1.0-3/debian/changelog	2020-06-26 00:15:52.000000000 +0000
+++ 3.1.0-3ubuntu1/debian/changelog	2021-08-17 07:36:18.000000000 +0000
@@ -1,3 +1,15 @@
+shibboleth-resolver (3.1.0-3ubuntu1) impish; urgency=medium
+
+  * Build using -std=gnu++14. Addresses: #984329.
+
+ -- Matthias Klose <doko@ubuntu.com>  Tue, 17 Aug 2021 09:36:18 +0200
+
+shibboleth-resolver (3.1.0-3build1) hirsute; urgency=medium
+
+  * No-change rebuild for shibboleth-sp soname change.
+
+ -- Matthias Klose <doko@ubuntu.com>  Fri, 22 Jan 2021 12:29:29 +0100
+
 shibboleth-resolver (3.1.0-3) unstable; urgency=medium
 
   * Re upload to include orig .asc
diff -pruN 3.1.0-3/debian/rules 3.1.0-3ubuntu1/debian/rules
--- 3.1.0-3/debian/rules	2020-05-13 20:08:48.000000000 +0000
+++ 3.1.0-3ubuntu1/debian/rules	2021-08-17 07:36:18.000000000 +0000
@@ -14,6 +14,8 @@ export DEB_BUILD_MAINT_OPTIONS = hardeni
 # Ensure that we link against all needed libraries (cf. Policy 10.2)
 export DEB_LDFLAGS_MAINT_APPEND = -Wl,-z,defs
 
+export DEB_CXXFLAGS_MAINT_APPEND = -std=gnu++14
+
 %:
 	dh $@